Technical datasheet

VESTODUR® X4877

Supplied byEvonik- Last Updated on Apr 28, 2026

VESTODUR® X4877 by Evonik is an easy flow, heat stabilized, polybutylene terephthalate (PBT) reinforced with 30% glass fiber. It exhibits increased impact strength, higher strain at break & resistance to heat (thermal stability) & chemical. This impact resistant grade contains lubricants & release agent. It is processed by injection molding. It is suitable for manufacture of parts which are subjected to high mechanical and thermal loads. VESTODUR® X4877 is used in automotive applications.
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VESTODUR® X4877 properties

Electrical properties

PropertiesValue & unitTest conditionTest method
Comparative Tracking Index (CTI)0.0 Visible After LoginVisible After LoginVisible After Login
Dielectric Strength0.0 Visible After LoginVisible After LoginVisible After Login
Dissipation Factor0.0 Visible After LoginVisible After LoginVisible After Login
Surface Resistance0.0 Visible After LoginVisible After LoginVisible After Login
Surface Resistivity0.0 Visible After LoginVisible After LoginVisible After Login
Volume Resistivity0.0 Visible After LoginVisible After LoginVisible After Login

Flammability properties

PropertiesValue & unitTest conditionTest method
Flame Rating, UL 940.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
50% Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Elongation at Break0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Shore D0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Charpy0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Charpy0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Charpy0.0 Visible After LoginVisible After LoginVisible After Login
Modulus of Elasticity0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Modulus, Creep0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength at Break0.0 Visible After LoginVisible After LoginVisible After Login

Other properties

PropertiesValue & unitTest conditionTest method
Dielectric Constant0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Ball Indentation0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login
Density, Melt0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage, Flow0.0 Visible After LoginVisible After LoginVisible After Login
Melt Volume Flow Rate (MVR)0.0 Visible After LoginVisible After LoginVisible After Login
Water Absorption0.0 Visible After LoginVisible After LoginVisible After Login

Processing properties

PropertiesValue & unitTest conditionTest method
Moisture Content0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
CTE, Linear, Parallel to Flow0.0 Visible After LoginVisible After LoginVisible After Login
Heat Deflection Temperature (HDT)0.0 Visible After LoginVisible After LoginVisible After Login
Heat Deflection Temperature (HDT)0.0 Visible After LoginVisible After LoginVisible After Login
Melting Point0.0 Visible After LoginVisible After LoginVisible After Login
Specific Heat Capacity0.0 Visible After LoginVisible After LoginVisible After Login
Thermal Conductivity0.0 Visible After LoginVisible After LoginVisible After Login
Vicat Softening Temperature0.0 Visible After LoginVisible After LoginVisible After Login
Vicat Softening Temperature0.0 Visible After LoginVisible After LoginVisible After Login

VESTODUR® X4877 Processing Guidelines

Injection Molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
Drying TemperatureVisible After LoginVisible After Login
Drying TimeVisible After LoginVisible After Login
Melt TemperatureVisible After LoginVisible After Login
Mold TemperatureVisible After LoginVisible After Login
Water contentVisible After LoginVisible After Login

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